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Finding the Fourth Proportional to 61,979.20, 92,968.80 and 56,438.80

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Solution

The fourth proportional to 61,979.20, 92,968.80 and 56,438.80 is: 84,658.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    61,979.20 : 92,968.80 = 56,438.80 : x
  2. Step 2: Convert to fraction form
    61,979.20/92,968.80 = 56,438.80/x
  3. Step 3: Cross multiply
    61,979.20x = 92,968.80 × 56,438.80
  4. Step 4: Simplify right side
    61,979.20x = 5,247,047,509.44
  5. Step 5: Solve for x
    x = 5,247,047,509.44/61,979.20
  6. Step 6: Final answer
    x = 84,658.20

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.